Evolution is a complex process through which organisms change over time; it is a process in which traits are passed from one generation to the next (Darwin and Beer 1996:108-139). Evolutionists have tried for centuries to explain the loss of function of various organs. The two most important scientists who studied evolution were Jean-Baptist Lamarck and Charles Darwin. Lamarck's theory of inheritance of acquired characteristics and Darwin's variational evolution were the most important theories that attempted to explain evolution before the discovery of genes in the early twentieth century. For two centuries, Lamarck's theory of inheritance of acquired characteristics has been at the center of controversy. The loss of function of the appendix according to Lamarck's theory was due either to the changing needs of man or to changes in the environment (Burkhardt 2013:793-796). The Lamarckian explanation of the loss of function of the appendix can be considered an evolutionary improvement when viewed through the lens of use and disuse and the inheritance of acquired traits. Use and disuse could explain why many species have lost the function of specific organs no longer needed and developed new beneficial characteristics (Burkhardt 2013:798-801). The human appendix, for example, is a remnant of an organ once useful for the digestion of cellulose. Most of the controversy surrounding Lamarck's theory concerns the inheritance of acquired traits. He believed that small changes in an organism could be the effect of changes in the environment and that those small changes could be passed on to the next generation. Lamarck believed that these changes brought benefits not only to the organism that developed them, but also to the whole...... half of the article ......n in his work there is the mechanism of inheritance of beneficial changes (Mills 2004: 116-118). In conclusion, Lamarck's theory involves adaptations to create new variations, followed by inheritance of these characteristics, while Darwin's theory involves random heritable variation first, followed by selection of the variation. Genetics has disproved Lamarck's theory on the basis that characteristics acquired during the life of a parent are not transmitted to offspring. On the other hand, Darwin's theory failed to explain why a beneficial change, such as loss of appendix function, could be passed down from generation to generation. However, both Lamarck and Darwin believed that life was constantly changing and that organisms changed to better adapt to their environment (Mills 2004:119-121).